Mukherjee will be speaking at the concluding function of RSS-organised "Tritiya Varsh Varg" on Thursday evening.
The Congress on Wednesday accused the saffron party of pursuing the RSS agenda against reservations.
Mani Shankar Aiyar secretly met Pakistan High Commissioner, says PM Narendra Modi at Gujarat poll rally
The PM also raised questions over the alleged appeal by former director general of the Pakistan Army, Sardar Arshad Rafiq, that senior Congress leader Ahmed Patel be made Gujarat chief minister.
Speaking at a meeting here, which was later addressed by Congress Vice President Rahul Gandhi, Ahmed Patel said, "We don't need lessons in nationalism from the BJP. They should look into themselves."
In a letter to Home Minister, Ahmed Patel said the BJP was trying to malign his image by dragging his name in the case.
A day after the Gujarat CM Vijay Rupani charged that a suspended ISIS operative used to work at a hospital where Congress strategist Ahmed Patel has been a trustee, the BJP sought to scale it up.
BJP has been demanding Patel's resignation over the issue that a suspected ISIS operative arrested recently used to work at a hospital where the senior Congress leader had been a trustee.
Gujarat CM Vijay Rupani links arrested Islamic State operatives with Congress' Ahmed Patel, demands resignation
Gujarat Chief Minister Vijay Rupani alleged that a suspected ISIS operative arrested recently used to work at a hospital where Congress leader Ahmed Patel Patel had been a trustee earlier.
Vaghela, who revolted against the Congress last month, claimed party leaders drew up the plan to ensure Patel's victory a day ahead of the voting on August 8.
Congress expels eight MLAs in Gujarat, including Vaghela, for defying party whip in Rajya Sabha polls
The Congress on Wednesday expelled eight rebel MLAs, including former Chief Minister Shankersinh Vaghela, for six years for anti-party activities.
Rajya Sabha elections do not take place by secret ballot as the voter has to show the marked ballot to the party's polling agent before putting it in the ballot box.
According to Rupani, the Congress MLAs from Banaskantha and other flood affected regions should have stayed with the people in this difficult time.